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Preparation method of calcium sulfate whisker

A calcium sulfate whisker and calcium oxide technology, applied in chemical instruments and methods, calcium/strontium/barium sulfate, single crystal growth, etc., can solve problems such as high temperature, pressure, and yield can not reach 100%, Achieve the effect of uniform length and diameter, good for environmental protection and easy to handle

Inactive Publication Date: 2007-05-02
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] Calcium sulfate whiskers synthesized by hydrothermal crystallization have the disadvantages of requiring very high temperature and pressure, and the yield cannot reach 100%.

Method used

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  • Preparation method of calcium sulfate whisker
  • Preparation method of calcium sulfate whisker

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Weigh 100g of industrial grade CaO into the reactor, add 500ml of distilled water, pretreat in ultrasonic to make large particles fully pulverized, then add 500ml of distilled water, and digest at 40-60°C. To obtain the lime emulsion, raise the temperature to 80°C, add sulfuric acid solution equimolar to calcium oxide, add self-made crystallization directing agent in the reaction process, the addition amount is 1% of the theoretical product production amount, stir for 40min, make it fully react, The reaction solution was separated by suction filtration while hot as soon as possible, and the X-ray diffraction spectrum and the electron microscope figure of the obtained product are as shown in Figure 1 and Figure 2.

[0022] The obtained calcium sulfate whisker products need different surface modifications according to different application objects to make them blend well with other materials. Easy to play its performance.

Embodiment 2

[0024] Except that the reaction temperature is 40° C., and 2% of a self-made crystallization directing agent is added, the other conditions are the same as in Example 1.

Embodiment 3

[0026] Except that the reaction temperature is 60°C, and 3% crystallization directing agent is added, the other conditions are the same as in Example 1.

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Abstract

This invention relates to a preparation of crystal whisker of calcium sulfate, particularly relating a preparation that produces fibriform mon-crystal of half water or dried gypsum, its concrete steps as following: (1) Adopt hydrothermal synthesis etc technology to compose target agent of crystallizing; (2) Firstly calcium oxide that is technica grade is pretreated, added into reaction vessel to digest at 40-60DEG C, calcarea galacta is obtained; (3) The calcarea galacta that is obtained raises temperature to 40-110DEG C in reaction vessel, add equimolar solution of sulphuric acid, mix 30-60min,add targeting agent of crystallizing in reaction process. Make it react sufficiently, obtain products of required crystal whisker of calcium sulfate by filtering, cleaning, surface treatment and drying. Characteristic of this invention is: add targeting agent of crystallizing that is self produced, control different reactive temperature, obtain crystal whisker of calcium sulfate with different dolicho- diameter ratio, dolicho- diameter of this product is uniform, dolicho- diameter ratio is large, purity of raw material has no strict requirement.

Description

technical field [0001] The invention relates to a method for preparing calcium sulfate whiskers, in particular to a method for producing hemihydrate and anhydrous calcium sulfate fibrous single crystals. Background technique [0002] Whiskers refer to fibrous single crystals with a fixed cross-sectional area, complete shape, perfect internal structure, and an aspect ratio as high as 5-1000. Due to its small diameter, the atomic arrangement is highly ordered during crystallization, which changes the defects of voids and dislocations that conventional materials have. Therefore, calcium sulfate whiskers have unique and excellent properties. It can be used as a medium-strength filler, and the reinforcing effect of fine-diameter fibers is close to that of other high-performance fiber-reinforced materials. The plastic products reinforced with it have improved tensile strength, bending strength, bending modulus of elasticity and heat distortion temperature. It can replace asbest...

Claims

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Application Information

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IPC IPC(8): C30B29/62C30B29/46C01F11/46
Inventor 张连红张洪林蒋林时张强于洪艳邱峰梁红玉姜虎生李长波赵国峥凤颀
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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